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  <section id="execute-process">
<span id="command:execute_process"></span><h1>execute_process<a class="headerlink" href="#execute-process" title="Link to this heading">¶</a></h1>
<p>Execute one or more child processes.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">execute_process(</span><span class="no">COMMAND</span><span class="w"> </span><span class="nv">&lt;cmd1&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;arguments&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">COMMAND</span><span class="w"> </span><span class="nv">&lt;cmd2&gt;</span><span class="w"> </span><span class="p">[</span><span class="nv">&lt;arguments&gt;</span><span class="p">]]...</span>
<span class="w">                </span><span class="p">[</span><span class="no">WORKING_DIRECTORY</span><span class="w"> </span><span class="nv">&lt;directory&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">TIMEOUT</span><span class="w"> </span><span class="nv">&lt;seconds&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">RESULT_VARIABLE</span><span class="w"> </span><span class="nv">&lt;variable&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">RESULTS_VARIABLE</span><span class="w"> </span><span class="nv">&lt;variable&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">OUTPUT_VARIABLE</span><span class="w"> </span><span class="nv">&lt;variable&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">ERROR_VARIABLE</span><span class="w"> </span><span class="nv">&lt;variable&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">INPUT_FILE</span><span class="w"> </span><span class="nv">&lt;file&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">OUTPUT_FILE</span><span class="w"> </span><span class="nv">&lt;file&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">ERROR_FILE</span><span class="w"> </span><span class="nv">&lt;file&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">OUTPUT_QUIET</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">ERROR_QUIET</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">COMMAND_ECHO</span><span class="w"> </span><span class="nv">&lt;where&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">OUTPUT_STRIP_TRAILING_WHITESPACE</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">ERROR_STRIP_TRAILING_WHITESPACE</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">ENCODING</span><span class="w"> </span><span class="nv">&lt;name&gt;</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">ECHO_OUTPUT_VARIABLE</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">ECHO_ERROR_VARIABLE</span><span class="p">]</span>
<span class="w">                </span><span class="p">[</span><span class="no">COMMAND_ERROR_IS_FATAL</span><span class="w"> </span><span class="o">&lt;</span><span class="no">ANY</span><span class="p">|</span><span class="no">LAST</span><span class="p">|</span><span class="no">NONE</span><span class="o">&gt;</span><span class="p">]</span><span class="nf">)</span>
</pre></div>
</div>
<p>Runs the given sequence of one or more commands.</p>
<p>Commands are executed concurrently as a pipeline, with the standard
output of each process piped to the standard input of the next.
A single standard error pipe is used for all processes.</p>
<p><code class="docutils literal notranslate"><span class="pre">execute_process</span></code> runs commands while CMake is configuring the project,
prior to build system generation.  Use the <span class="target" id="index-0-command:add_custom_target"></span><a class="reference internal" href="add_custom_target.html#command:add_custom_target" title="add_custom_target"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">add_custom_target()</span></code></a> and
<span class="target" id="index-0-command:add_custom_command"></span><a class="reference internal" href="add_custom_command.html#command:add_custom_command" title="add_custom_command"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">add_custom_command()</span></code></a> commands to create custom commands that run
at build time.</p>
<p>Options:</p>
<dl>
<dt><code class="docutils literal notranslate"><span class="pre">COMMAND</span></code></dt><dd><p>A child process command line.</p>
<p>CMake executes the child process using operating system APIs directly:</p>
<ul>
<li><p>On POSIX platforms, the command line is passed to the child process
in an <code class="docutils literal notranslate"><span class="pre">argv[]</span></code> style array.  No intermediate shell is executed,
so shell operators such as <code class="docutils literal notranslate"><span class="pre">&gt;</span></code> are treated as normal arguments.</p></li>
<li><p>On Windows platforms, the command line is encoded as a string such
that child processes using <a class="reference external" href="https://learn.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-commandlinetoargvw">CommandLineToArgvW</a> will decode the
original arguments.</p>
<p>If the command runs a <code class="docutils literal notranslate"><span class="pre">.exe</span></code>, <code class="docutils literal notranslate"><span class="pre">.com</span></code>, or other executable,
no intermediate command interpreter is executed, so shell operators
such as <code class="docutils literal notranslate"><span class="pre">&gt;</span></code> are treated as normal arguments.</p>
<p>If the command runs a <code class="docutils literal notranslate"><span class="pre">.bat</span></code> or <code class="docutils literal notranslate"><span class="pre">.cmd</span></code> script, it is executed
through the <code class="docutils literal notranslate"><span class="pre">cmd</span></code> command interpreter.  The command interpreter
does not use <a class="reference external" href="https://learn.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-commandlinetoargvw">CommandLineToArgvW</a>, so some arguments may be received
by the script with extra quoting.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 4.0: </span><code class="docutils literal notranslate"><span class="pre">.bat</span></code> and <code class="docutils literal notranslate"><span class="pre">.cmd</span></code> scripts are now explicitly executed through the
command interpreter by prepending <code class="docutils literal notranslate"><span class="pre">cmd</span> <span class="pre">/c</span> <span class="pre">call</span></code> to the command line.
Previously, they were implicitly executed through <code class="docutils literal notranslate"><span class="pre">cmd</span> <span class="pre">/c</span></code>, without
<code class="docutils literal notranslate"><span class="pre">call</span></code>, by undocumented behavior of <a class="reference external" href="https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-createprocessw">CreateProcessW</a>.</p>
</div>
</li>
</ul>
<p>Use the <code class="docutils literal notranslate"><span class="pre">INPUT_*</span></code>, <code class="docutils literal notranslate"><span class="pre">OUTPUT_*</span></code>, and <code class="docutils literal notranslate"><span class="pre">ERROR_*</span></code> options to
redirect stdin, stdout, and stderr.</p>
<p>For <strong>sequential execution</strong> of multiple commands use multiple
<code class="docutils literal notranslate"><span class="pre">execute_process</span></code> calls each with a single <code class="docutils literal notranslate"><span class="pre">COMMAND</span></code> argument.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">WORKING_DIRECTORY</span></code></dt><dd><p>The named directory will be set as the current working directory of
the child processes.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">TIMEOUT</span></code></dt><dd><p>After the specified number of seconds (fractions allowed), all unfinished
child processes will be terminated, and the <code class="docutils literal notranslate"><span class="pre">RESULT_VARIABLE</span></code> will be
set to a string mentioning the &quot;timeout&quot;.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">RESULT_VARIABLE</span></code></dt><dd><p>The variable will be set to contain the result of last child process.
This will be an integer return code from the last child or a string
describing an error condition.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">RESULTS_VARIABLE</span> <span class="pre">&lt;variable&gt;</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">Added in version 3.10.</span></p>
</div>
<p>The variable will be set to contain the result of all processes as a
<a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-lists"><span class="std std-ref">semicolon-separated list</span></a>, in order of the
given <code class="docutils literal notranslate"><span class="pre">COMMAND</span></code> arguments.  Each entry will be an integer return code
from the corresponding child or a string describing an error condition.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">INPUT_FILE</span> <span class="pre">&lt;file&gt;</span></code></dt><dd><p><code class="docutils literal notranslate"><span class="pre">&lt;file&gt;</span></code> is attached to the standard input pipe of the <em>first</em> <code class="docutils literal notranslate"><span class="pre">COMMAND</span></code>
process.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">OUTPUT_FILE</span> <span class="pre">&lt;file&gt;</span></code></dt><dd><p><code class="docutils literal notranslate"><span class="pre">&lt;file&gt;</span></code> is attached to the standard output pipe of the <em>last</em> <code class="docutils literal notranslate"><span class="pre">COMMAND</span></code>
process.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">ERROR_FILE</span> <span class="pre">&lt;file&gt;</span></code></dt><dd><p><code class="docutils literal notranslate"><span class="pre">&lt;file&gt;</span></code> is attached to the standard error pipe of <em>all</em> <code class="docutils literal notranslate"><span class="pre">COMMAND</span></code>
processes.</p>
</dd>
</dl>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.3: </span>If the same <code class="docutils literal notranslate"><span class="pre">&lt;file&gt;</span></code> is named for both <code class="docutils literal notranslate"><span class="pre">OUTPUT_FILE</span></code> and <code class="docutils literal notranslate"><span class="pre">ERROR_FILE</span></code>
then it will be used for both standard output and standard error pipes.</p>
</div>
<dl>
<dt><code class="docutils literal notranslate"><span class="pre">OUTPUT_QUIET</span></code>, <code class="docutils literal notranslate"><span class="pre">ERROR_QUIET</span></code></dt><dd><p>The standard output on <code class="docutils literal notranslate"><span class="pre">OUTPUT_VARIABLE</span></code> or standard error on
<code class="docutils literal notranslate"><span class="pre">ERROR_VARIABLE</span></code> are not connected (no variable content).
The  <code class="docutils literal notranslate"><span class="pre">*_FILE</span></code> and <code class="docutils literal notranslate"><span class="pre">ECHO_*_VARIABLE</span></code> options are not affected.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">OUTPUT_VARIABLE</span></code>, <code class="docutils literal notranslate"><span class="pre">ERROR_VARIABLE</span></code></dt><dd><p>The variable named will be set with the contents of the standard output
and standard error pipes, respectively.  If the same variable is named
for both pipes their output will be merged in the order produced.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">OUTPUT_STRIP_TRAILING_WHITESPACE</span></code>, <code class="docutils literal notranslate"><span class="pre">ERROR_STRIP_TRAILING_WHITESPACE</span></code></dt><dd><p>Removes whitespace characters from the end of the values stored in the
corresponding <code class="docutils literal notranslate"><span class="pre">OUTPUT_VARIABLE</span></code> and <code class="docutils literal notranslate"><span class="pre">ERROR_VARIABLE</span></code> variables.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">ECHO_OUTPUT_VARIABLE</span></code>, <code class="docutils literal notranslate"><span class="pre">ECHO_ERROR_VARIABLE</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">Added in version 3.18.</span></p>
</div>
<p>The standard output or standard error will not be exclusively redirected to
the specified variables.</p>
<p>The output will be duplicated into the specified variables and also onto
standard output or standard error analogous to the <code class="docutils literal notranslate"><span class="pre">tee</span></code> Unix command.</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>If more than one <code class="docutils literal notranslate"><span class="pre">OUTPUT_*</span></code> or <code class="docutils literal notranslate"><span class="pre">ERROR_*</span></code> option is given for the
same pipe the precedence is <em>not specified</em>.
If no <code class="docutils literal notranslate"><span class="pre">OUTPUT_*</span></code> or <code class="docutils literal notranslate"><span class="pre">ERROR_*</span></code> options are given the output will
be shared with the corresponding pipes of the CMake process itself.</p>
</div>
<dl>
<dt><code class="docutils literal notranslate"><span class="pre">COMMAND_ECHO</span> <span class="pre">&lt;where&gt;</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">Added in version 3.15.</span></p>
</div>
<p>The command being run will be echo'ed to <code class="docutils literal notranslate"><span class="pre">&lt;where&gt;</span></code> with <code class="docutils literal notranslate"><span class="pre">&lt;where&gt;</span></code>
being set to one of <code class="docutils literal notranslate"><span class="pre">STDERR</span></code>, <code class="docutils literal notranslate"><span class="pre">STDOUT</span></code> or <code class="docutils literal notranslate"><span class="pre">NONE</span></code>.
See the <span class="target" id="index-0-variable:CMAKE_EXECUTE_PROCESS_COMMAND_ECHO"></span><a class="reference internal" href="../variable/CMAKE_EXECUTE_PROCESS_COMMAND_ECHO.html#variable:CMAKE_EXECUTE_PROCESS_COMMAND_ECHO" title="CMAKE_EXECUTE_PROCESS_COMMAND_ECHO"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXECUTE_PROCESS_COMMAND_ECHO</span></code></a> variable for a way
to control the default behavior when this option is not present.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">ENCODING</span> <span class="pre">&lt;name&gt;</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">Added in version 3.8.</span></p>
</div>
<p>On Windows, the encoding that is used to decode output from the process.
Ignored on other platforms.
Valid encoding names are:</p>
<dl>
<dt><code class="docutils literal notranslate"><span class="pre">NONE</span></code></dt><dd><p>Perform no decoding.  This assumes that the process output is encoded
in the same way as CMake's internal encoding (UTF-8).</p>
<p>This was the default in CMake 3.14 and older.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">AUTO</span></code></dt><dd><p>Use the current active console's codepage or if that isn't
available then use ANSI.</p>
<p>This was the default in CMake 3.15 through 3.30.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">ANSI</span></code></dt><dd><p>Use the ANSI codepage.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">OEM</span></code></dt><dd><p>Use the original equipment manufacturer (OEM) code page.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">UTF-8</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">Added in version 3.11.</span></p>
</div>
<p>Use the UTF-8 codepage.</p>
<p>This is the default since CMake 3.31.  See policy <span class="target" id="index-0-policy:CMP0176"></span><a class="reference internal" href="../policy/CMP0176.html#policy:CMP0176" title="CMP0176"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0176</span></code></a>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">UTF8</span></code></dt><dd><p>Use the UTF-8 codepage.  Use of this name is discouraged in favor
of <code class="docutils literal notranslate"><span class="pre">UTF-8</span></code> to match the
<a class="reference external" href="https://datatracker.ietf.org/doc/html/rfc3629">UTF-8 RFC</a>
naming convention.</p>
</dd>
</dl>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">COMMAND_ERROR_IS_FATAL</span> <span class="pre">&lt;ANY|LAST|NONE&gt;</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">Added in version 3.19.</span></p>
</div>
<p>The option following <code class="docutils literal notranslate"><span class="pre">COMMAND_ERROR_IS_FATAL</span></code> determines the behavior when
an error is encountered:</p>
<dl>
<dt><code class="docutils literal notranslate"><span class="pre">ANY</span></code></dt><dd><p>If any of the commands in the list of commands fail, the
<code class="docutils literal notranslate"><span class="pre">execute_process()</span></code> command halts with an error.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">LAST</span></code></dt><dd><p>If the last command in the list of commands fails, the
<code class="docutils literal notranslate"><span class="pre">execute_process()</span></code> command halts with an error.
Commands earlier in the list will not cause a fatal error.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">NONE</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">Added in version 4.0.</span></p>
</div>
<p>Regardless of any of the commands failing, the <code class="docutils literal notranslate"><span class="pre">execute_process()</span></code>
command will not halt with an error.</p>
</dd>
</dl>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 4.0: </span>If not provided, the
<span class="target" id="index-0-variable:CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL"></span><a class="reference internal" href="../variable/CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL.html#variable:CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL" title="CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL</span></code></a> variable
is checked.  If the variable is not set, the default is <code class="docutils literal notranslate"><span class="pre">NONE</span></code>.
If <code class="docutils literal notranslate"><span class="pre">RESULT_VARIABLE</span></code> or <code class="docutils literal notranslate"><span class="pre">RESULTS_VARIABLE</span></code> is supplied,
<span class="target" id="index-1-variable:CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL"></span><a class="reference internal" href="../variable/CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL.html#variable:CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL" title="CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL</span></code></a> is ignored.</p>
</div>
</dd>
</dl>
</section>


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